SRB results are generated using two different algorithms. The two methods use different approaches. Both methods apply spectral and angular corrections (based on Nimbus-7 Earth Radiation Budget (ERB) and Earth Radiation Budget Experiment (ERBE) results) which are not included in the original ISCCP data. They also separate surface from aerosol effects which is not included in ISCCP. Each method uses its own cloud algorithm which has been compared with experimental data from a number of regions. The Satellite Data Analysis Center (SDAC) also compares basic SRB results with the limited amount of ground truth data that are available. The user may have increased confidence in the SRB results for those cells wherein the two methods obtain values that differ only slightly. Caution is suggested for those cells where the two methods differ by a large amount.